Today's Message Index:
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0. 07:34 AM - Reminder (Matt Dralle)
1. 07:59 AM - Flying Mk 3 Xtra tail heavy (Dan Breitigam)
2. 02:39 PM - Re: Flying Mk 3 Xtra tail heavy (Richard Pike)
3. 03:48 PM - Re: Flying Mk 3 Xtra tail heavy (Gary Aman)
4. 03:51 PM - Re: Flying Mk 3 Xtra tail heavy (Dan Breitigam)
5. 06:07 PM - Re: Wing support dolly (woody)
6. 06:36 PM - Re: Re: Flying Mk 3 Xtra tail heavy (Wayne Schneider)
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Dear Listers,
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Subject: | Flying Mk 3 Xtra tail heavy |
Hello all,
I am getting ready to test fly my Mark III Xtra after restoration and new engine
(1.3 liter Geo Metro 100 HP). Weight and balance shows it is barely in the envelope
on the tail heavy side.
Question 1: Is it safe to fly?
Question 2: What arm do folks use for the distance to datum for pilot/passenger
and 19 gal fuel tank?
Question 3: Does anyone carry extra nose weight when flying solo?
Thanx!
Dan in Chattanooga
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475051#475051
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Subject: | Re: Flying Mk 3 Xtra tail heavy |
As long as it is within the envelope, it is safe to fly, however, some of the questions
you ask make me wonder how you calculated your weight and balance. (no
offense, this is not an easy topic, and it is like using MS Windows: there are
many ways to do one task)
Check out this link: http://oh2fly.net/oldpoops/Lexan%20rear%20enclosure.html
Scroll down until you get to the Gen-U-Wine Kolb MKIII W&B pages.
The CG of people is determined at the belly button. (seriously) So your moment
arm from that point to what you think is the center of weight of your gas tank
is what you would use for the difference between full fuel/empty fuel, solo or
2 up, and all permutations of that particular equation.
I do not carry nose weight, but if I lose another 30 pounds I will need it if I
fly solo. (LOL)
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and Grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475081#475081
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Subject: | Re: Flying Mk 3 Xtra tail heavy |
At 175# solo my mk3 is at the aft limit Fine in smooth air but when bumpy
it wallows like passing over the wake of a boat then back to stable. I have about
40 # of shot in a plastic and denim bag and the Claw tie downs secured to
rings on pass side floor which cures the handling. Fuel affects CG almost none
Sent from my iPhone
> On Nov 15, 2017, at 10:56 AM, Dan Breitigam <dbrtgm@me.com> wrote:
>
> all,
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Subject: | Re: Flying Mk 3 Xtra tail heavy |
I checked out the link you recommended Richard but the shape of the tank I got
from Bryan is not square like in the plans. It is triangular or more accurately
a trapezoid shape. So the center of mass is not intuitive. Therefore I dont
know how to determine the arm length to use in the formula which I have laid out
in Excell.
Of course I could weigh it with full fuel but I just wanted to calculate W&B with
my Excell file.
Thanx,
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475083#475083
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Subject: | Re: Wing support dolly |
I don't have plans, but I have a fine boom dolly that I put together a few years
back. I don't have a picture available but will take some, along with measurements
when I get over to my hanger, tomorrow I hope. 8)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475084#475084
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Subject: | Re: Flying Mk 3 Xtra tail heavy |
You can calculate the arm of the fuel by weighing the plane twice.
Once with it empty and again with full fuel.
Below is a made up example. The result is that the fuel is at an arm of
13.36.
I can send you an Excel spreadsheet to do this if you email me off line.
Left Main Right Main Tail wheel
Datum distance 9 9 195
Empty Weights 222.42 224.92 60.4
507.74 Total Empty Weight
Empty Moment 2001.78 2024.28 11778
15804.06 Total Empty Moment
31.13 Empty Weight C.G.
Full Fuel Weights 256 258 62
576 Total Weight Full Fuel
Full Fuel Moment 2304 2322 12090
16716 Total Full Fuel Moment
29.02 Full Fuel C.G.
Fuel Weight 68.2600000000001
Fuel Moment 911.940000000001
Fuel Arm 13.36
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